2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Optimize the frame type.
24 * @author Michael Beck
27 * Optimize the frame type by removing unused type members.
31 #include "iroptimize.h"
32 #include "irgraph_t.h"
38 * Optimize the frame type of an irg by removing
39 * never touched entities.
41 void opt_frame_irg(ir_graph *irg) {
42 ir_type *frame_tp = get_irg_frame_type(irg);
43 ir_entity *ent, *list;
45 int i, n = get_class_n_members(frame_tp);
50 /* clear all entity links */
51 for (i = n - 1; i >= 0; --i) {
52 ent = get_class_member(frame_tp, i);
53 set_entity_link(ent, NULL);
57 frame = get_irg_frame(irg);
59 if (edges_activated(irg)) { /* use inplace edges */
60 const ir_edge_t *edge;
62 /* mark all used entities */
63 foreach_out_edge(frame, edge) {
64 sel = get_edge_src_irn(edge);
65 ent = get_Sel_entity(sel);
66 set_entity_link(ent, ent);
69 /* use traditionally out edges */
72 /* mark all used entities */
73 for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
74 sel = get_irn_out(frame, i);
75 ent = get_Sel_entity(sel);
76 set_entity_link(ent, ent);
80 /* link unused ones */
82 for (i = n - 1; i >= 0; --i) {
83 ent = get_class_member(frame_tp, i);
84 if (get_entity_link(ent) == NULL) {
85 set_entity_link(ent, list);
91 /* delete list members */
92 for (ent = list; ent; ent = list) {
93 list = get_entity_link(ent);
94 remove_class_member(frame_tp, ent);
96 /* we changed the frame type, it's layout should be redefined */
97 set_type_state(frame_tp, layout_undefined);